Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - A unique BBC application
View Single Post
  #43 (permalink)  
Old 01-26-2010, 08:43 AM
OLNOLAN's Avatar
Registered User
Last photo:
Join Date: Apr 2009
Posts: 1,117
Wiki Edits: 0

Thanks: 637
Thanked 183 Times in 139 Posts

Yep, Its zackly what you thought according to my piston book,says 9.99:1.
It should go a bit quicker without the extra baggage. Properly chosen exhaust and camshaft should wake her up. Something gives me a feeling that its got a tiny cam in it, does it have any lope in the idle? For best performance the exhaust should push out water for the shortest distance possible with the least restriction. All the big offshore powerboats use real short tailpipes for this reason. 10:1 may need premium w/octane booster added. If you indeed have the old style valve seats, lead substitute additive may be needed also. As far as propping goes, you understand that pretty good already. The only difference in your prop theory and mine is the fact sterndrives are limited to 5000rpms input or they go caa-boom. With your 1:1 box that can handle about anything you throw at it, your only limit is when your engine goes caa-boom. I have learned a bunch of top speed tricks from an old outboard drag guy and a few more from my buddy that is a propeller specialist, but I'll save them until you get it going again. olnolan

oh, yep, any automotive machine shop should be able to set the cam up in v-blocks, check and chart it for duration and lift.

Last edited by OLNOLAN; 01-26-2010 at 08:50 AM. Reason: added info
Reply With Quote